Stimulant drugs can be used to treat a number of medical conditions.
For example, Ritalin, Adderall, and Concerta are all drugs used to treat Attention Deficit Hyperactivity Disorder (ADHD) in children and adults.
There are others, but these are the most widely recognized and prescribed drugs.
Different people react in different ways to any type of drug, and this hold true for stimulants.
For this reason, what works for your neighbor's child's ADHD or your neighbor if she has adult ADHD may not work for your child. But, since your health care professional has access to several different kinds of stimulant drugs, he can work with you to determine the best one for whomever in the family is suffering from ADHD.
Stimulant drugs are also used to treat a condition called narcolepsy. A person who suffers from narcolepsy literally "falls asleep on his feet". The person has no control over when and where sleep will overcome him and this can be very dangerous. Stimulants help the brain process the signals that trigger the need or desire for sleep so that this condition can be better controlled.
Some doctors prescribe stimulants for weight control. It's true that there are over-the-counter medications that contain stimulants available without a prescription, but the ones that are prescribed generally work better and tend to be safer.
Adipex is one medication that can be prescribed for weight control. It works by stimulating the brain to release Norepinephrine (also called adrenaline), a hormone found in the brain. Adrenaline increases heart rate and raises the blood pressure, while at the same time acting as an appetite suppressant.